package org.example.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.Scanner;
/**
 * JDBC执行DML语句:UPDATE
 * 修改密码功能;
 * 输入用户名: Tony
 * 输入新密码: 654321
 * 结果: 修改成功  |  该用户不存在,修改失败;
 */
public class JdbcDemo2 {
    public static void main(String[] args) throws Exception {
          /*
            1.加载驱动: Class.forName("");
            2.创建连接对象: DriverManager.getConnection();
            3.执行对象:connection.createStatement();
            4.执行SQL:statement.executeUpdate();
            5.断开连接: connection.close();
         */
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root");
        Statement statement = connection.createStatement();
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String username = scanner.nextLine();
        System.out.println("请输入新密码：");
        String password = scanner.nextLine();
        String sql = "UPDATE userinfo  SET password = '"+password+"' WHERE  username = '"+username+"'";
        int i = statement.executeUpdate(sql);
        if (i!= 0){
            System.out.println("修改成功");
        }else{
            System.out.println("用户名不存在");
        }
        connection.close();
    }
}
